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The Internal Structure of a BattleMech forms the skeletal structure of the 'Mech to which all components are mounted.

Standard Internal Structure

The Standard Internal Structure of a 'Mech weighs 10% of its max. tonnage (i.e. on a 100 ton Atlas the internal structure weighs 10 tons).

It is the least bulky structure and does not take up any critical hit slots. It is also the least expensive and converting a 'Mech to it costs the 'Mechs maximum tonnage x 5,000 (on an Atlas, it would cost 500,000 ).

Endo-Steel Internal Structure

The Endo-Steel Internal Structure of a 'Mech weighs only 5% of its max. tonnage (i.e. on a 100 ton Atlas, it would only take up 5 tons), or half as much as Standard Internal Structure, but it requires 14 Critical Slots on Inner Sphere 'Mechs and 7 slots on Clan 'Mechs.

However, converting to Endo-Steel costs the 'Mechs max. tonnage x 10,000 (on an Atlas, it would cost 1,000,000 .

Depending on the 'Mechs tonnage, each of its locations has a certain amount of internal health, equal to 1/2 of the maximum amount of armor that can be mounted in that component. The one exception is the Head, which receives 18 internal hit points. (Note: The total health of the head component is somewhat disputed as some users claim to be able to "headshot" or "one-shot" 'Mechs with only a 35 point alpha strike. The maximum suggested here is 36, and could be less depending on the amount of armor allocated to the Head component.)

Number of equipable internal hit points with different 'Mech weights:

Tonnage

Internal Structure

'Mech

total

HD

RA + LA

RL + LL

RT

CT

LT

20

78

18

6

8

10

12

10

25

98

18

8

12

12

16

12

30

114

18

10

14

14

20

14

35

128

18

12

16

16

22

16

40

146

18

12

20

20

24

20

45

162

18

14

22

22

28

22

50

178

18

16

24

24

32

24

55

194

18

18

26

26

36

26

60

210

18

20

28

28

40

28

65

220

18

20

30

30

42

30

70

226

18

22

30

30

44

30

75

240

18

24

32

32

46

32

80

256

18

26

34

34

50

34

85

272

18

28

36

36

54

36

90

288

18

30

38

38

58

38

95

302

18

32

40

40

60

40

100

316

18

34

42

42

62

42

Note:

Each arm and leg has the given amount of internal hit points.

Each torso does not split internal hit points front/rear is they do for armor allocation.

Regarding Standard vs. Endo-Steel:

A 'Mechs maximum amount of internal health is independent of the type of internal structure equipped.

Different types of internal structure result in a different weight (tons) with equal health.

The trade-in for weight saving comes in the consumption of Critical Slots.

When a battlemech's armour has been destroyed the battlemech starts to take damage to its internal structure, weapons systems and other equipment. When the internal structure of a battlemech's head, center torso or both legs are destroyed, the battlemech is destroyed. If an XL engine is fitted to the battlemech, the destruction of a side torso will also destroy the battlemech.

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